To become a Roblox shirt tester, you need to have access to Roblox's shirt creation tools, which are available to all users. However, to sell your designs, a premium membership is required.

Roblox announces a big change that revamps the process of uploading and selling custom content on its Marketplace.

"Roblox took the opposite approach, and that's to say, 'No, we want to build this for kids and give them a space not just to consume content, but to create it," Balkam said.